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In Microsoft Office Communications Server 2007, Mediation Server receives a re-invite request without having Session Description Protocol (SDP) on its gateway side.
When this occurs, Mediation Server does not handle the request correctly. Mediation Server responds with an SDP that contains the present direction attribute of the peer side of the call.
For example, consider the following scenario:
Mediation Server receives a re-invite request without having SDP on its gateway side.
The request is to move a call from one telephone set to another telephone set on the gateway side of Mediation Server.
The gateway side previously sent a direction attribute of "inactive."
The proxy side of the call is "on hold."
In this scenario, Mediation Server responds with the direction attribute of "inactive" in SDP in response to the re-invite request on its gateway side.
To resolve this problem, install update 943086.
For more information about update 943086, click the following article number to view the article in the Microsoft Knowledge Base:
943086 Description of the update package for Communications Server 2007 Mediation Server: December 17, 2007
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
After you apply this update, when Mediation Server receives a re-invite request without having SDP on its gateway side, Mediation Server responds with a direction attribute that reflects the maximum capability of the peer side of the call.